USGS Body-Wave Moment Tensor Solution

SOUTH OF MARIANA ISLANDS

12/09/11 16:36:50.49

Epicenter:  11.885  143.146
MW 5.8

USGS MOMENT TENSOR SOLUTION
Depth   8         No. of sta: 73
Moment Tensor;   Scale 10**17 Nm
  Mrr= 4.16       Mtt=-4.93
  Mpp= 0.78       Mrt= 5.04
  Mrp= 1.17       Mtp=-1.20
 Principal axes:
  T  Val=  6.46  Plg=66  Azm=345
  N        1.02       1       78
  P       -7.48      24      168

Best Double Couple:Mo=7.0*10**17
 NP1:Strike= 77 Dip=69 Slip=  89
 NP2:       261     21        93

Moment Tensor Solution
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.

Moment Tensor Solution